 /* 基础样式 */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Microsoft YaHei', sans-serif;
      color: #fff;
      overflow-x: hidden;
      position: relative;
      scroll-behavior: smooth; /* 平滑滚动 */
    }

    /* 页面加载动画 */
    .loader {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: #000;
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 9999;
      transition: opacity 0.8s ease;
    }

    .loader-logo {
      width: 150px;
      height: 150px;
      background: url('../img/logo.webp') center/contain no-repeat;
      animation: pulse 1.5s infinite ease-in-out;
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); opacity: 1; }
      50% { transform: scale(1.1); opacity: 0.8; }
    }

    /* 视频背景 */
    .video-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      overflow: hidden;
    }

    .video-bg video {
      min-width: 100%;
      min-height: 100%;
      object-fit: cover;
      transition: opacity 1s ease;
    }

    /* 视频加载遮罩 */
    .video-loading {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.7);
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 1;
    }

    .video-loading::after {
      content: "";
      width: 40px;
      height: 40px;
      border: 4px solid rgba(255,255,255,0.3);
      border-radius: 50%;
      border-top-color: #fff;
      animation: spin 1s infinite linear;
    }

    @keyframes spin {
      to { transform: rotate(360deg); }
    }

    /* 固定文字 */
    .fixed-text {
      position: fixed;
      z-index: 10;
      padding: 20px;
    }

    .top-text {
      top: 0;
      left: 0;
      display: flex;
      align-items: center;
      gap: 15px;
      transition: transform 0.3s ease;
    }

    .top-text.scrolled {
      transform: translateY(-100%);
    }

    .top-text img {
      height: 40px;
    }

    .top-text span {
      font-size: 1.5rem;
      font-weight: bold;
      text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    }

    .bottom-text {
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      text-align: center;
      text-shadow: 0 2px 8px rgba(0,0,0,0.8);
      padding-bottom: 50px;
      transition: opacity 0.5s ease, transform 0.5s ease;
    }

    .bottom-text.hidden {
      opacity: 0;
      transform: translate(-50%, 50px);
      pointer-events: none;
    }

    .bottom-text h1 {
      font-size: 3rem;
      margin-bottom: 10px;
      animation: fadeInUp 1.5s ease-out;
    }

    .bottom-text p {
      font-size: 1.2rem;
      animation: fadeInUp 1.5s ease-out 0.3s forwards;
      opacity: 0;
    }

    /* 向下滚动提示 */
    .scroll-down {
      position: fixed;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 10;
      cursor: pointer;
      animation: bounce 2s infinite;
      transition: opacity 0.5s ease;
    }

    .scroll-down.hidden {
      opacity: 0;
      pointer-events: none;
    }

    .scroll-down i {
      font-size: 2rem;
      color: white;
      text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    }

    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
      40% { transform: translateY(-20px) translateX(-50%); }
      60% { transform: translateY(-10px) translateX(-50%); }
    }

    /* 侧边导航 */
    .side-nav {
      position: fixed;
      right: 0;
      top: 50%;
      transform: translateY(-50%);
      z-index: 20;
      padding: 20px;
      transition: transform 0.3s ease;
    }

    .sidebar {
      background: rgba(0,0,0,0.5);
      border-radius: 10px;
      padding: 15px;
      backdrop-filter: blur(5px);
    }

    .menu-item {
      padding: 10px 15px;
      margin: 8px 0;
      cursor: pointer;
      border-radius: 5px;
      transition: all 0.3s ease;
      position: relative;
    }

    .menu-item::after {
      content: "";
      position: absolute;
      right: 0;
      top: 0;
      height: 100%;
      width: 3px;
      background: #165DFF;
      transform: scaleY(0);
      transition: transform 0.3s ease;
      border-radius: 3px;
    }

    .menu-item:hover {
      background: rgba(255,255,255,0.2);
      transform: translateX(-5px);
    }

    .menu-item.active {
      background: rgba(255,255,255,0.2);
    }

    .menu-item.active::after {
      transform: scaleY(1);
    }

    /* 移动端菜单按钮 */
    .mobile-menu-btn {
      display: none;
      position: fixed;
      right: 20px;
      top: 20px;
      z-index: 30;
      background: rgba(0,0,0,0.5);
      border: none;
      color: white;
      width: 50px;
      height: 50px;
      border-radius: 50%;
      font-size: 1.5rem;
      cursor: pointer;
      backdrop-filter: blur(5px);
    }

    /* 主内容容器 */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 120px 20px 80px;
      background: rgba(0,0,0,0.6);
      backdrop-filter: blur(10px);
      border-radius: 15px;
      margin-top: 100vh;
      margin-bottom: 50px;
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 1s ease, transform 1s ease;
    }

    .container.visible {
      opacity: 1;
      transform: translateY(0);
    }

    h1 {
      text-align: center;
      margin-bottom: 40px;
      font-size: 2.5rem;
      text-shadow: 0 2px 4px rgba(0,0,0,0.5);
      position: relative;
      display: inline-block;
      left: 50%;
      transform: translateX(-50%);
    }

    h1::after {
      content: "";
      position: absolute;
      bottom: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 80px;
      height: 3px;
      background: #165DFF;
      border-radius: 3px;
    }

    /* 轮播图样式 */
    .carousel {
      position: relative;
      max-width: 800px;
      margin: 0 auto 40px;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 10px 30px rgba(0,0,0,0.3);
      height: 450px;
    }

    .carousel-img-wrapper {
      position: relative;
      height: 100%;
    }

    .carousel-img {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0;
      transition: opacity 0.8s ease, transform 0.8s ease;
      transform: scale(1.05);
    }

    .carousel-img.active {
      opacity: 1;
      transform: scale(1);
      z-index: 1;
    }

    .carousel-btn {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      background: rgba(0,0,0,0.3);
      color: white;
      border: none;
      width: 50px;
      height: 50px;
      font-size: 1.5rem;
      cursor: pointer;
      transition: all 0.3s ease;
      z-index: 5;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .carousel-btn.prev {
      left: 10px;
    }

    .carousel-btn.next {
      right: 10px;
    }

    .carousel-btn:hover {
      background: rgba(0,0,0,0.7);
      transform: translateY(-50%) scale(1.1);
    }

    /* 轮播指示器 */
    .carousel-indicators {
      position: absolute;
      bottom: 15px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 10px;
      z-index: 5;
    }

    .indicator {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: rgba(255,255,255,0.5);
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .indicator.active {
      background: white;
      transform: scale(1.2);
      box-shadow: 0 0 10px rgba(255,255,255,0.8);
    }

    /* 描述文字区域 */
    .desc {
      max-width: 800px;
      margin: 0 auto 30px;
      line-height: 1.8;
      font-size: 1.1rem;
      text-shadow: 0 1px 2px rgba(0,0,0,0.5);
    }

    .desc p {
      margin-bottom: 15px;
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.8s ease, transform 0.8s ease;
    }

    /* 按钮样式 */
    .know-more-btu {
      display: block;
      margin: 0 auto;
      padding: 12px 30px;
      background: #165DFF;
      color: white;
      border: none;
      border-radius: 30px;
      font-size: 1.1rem;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 4px 12px rgba(22, 93, 255, 0.4);
      position: relative;
      overflow: hidden;
      z-index: 1;
    }

    .know-more-btu::after {
      content: "";
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
      transition: all 0.6s ease;
      z-index: -1;
    }

    .know-more-btu:hover {
      background: #0E4CD1;
      transform: translateY(-3px);
      box-shadow: 0 6px 16px rgba(22, 93, 255, 0.6);
    }

    .know-more-btu:hover::after {
      left: 100%;
    }

    /* 动画效果 */
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(20px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    /* 响应式设计 */
    @media (max-width: 768px) {
      .bottom-text h1 {
        font-size: 2rem;
      }

      .container {
        padding: 80px 15px 60px;
        margin-top: 100vh;
      }

      h1 {
        font-size: 2rem;
      }

      .carousel {
        max-width: 100%;
        height: 300px;
      }

      .side-nav {
        transform: translateX(100%) translateY(-50%);
        background: rgba(0,0,0,0.8);
        width: 250px;
        height: 100vh;
        top: 0;
        right: 0;
        padding: 80px 20px 20px;
        backdrop-filter: blur(10px);
      }

      .side-nav.open {
        transform: translateX(0) translateY(0);
      }

      .sidebar {
        background: transparent;
        padding: 0;
      }

      .menu-item {
        padding: 15px;
        margin: 5px 0;
        font-size: 1.1rem;
      }

      .mobile-menu-btn {
        display: block;
      }
    }
